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Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

creal.3p (2297B)

    

  1. '\" et
  2. .TH CREAL "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
  3. .\"
  4. .SH PROLOG
  5. This manual page is part of the POSIX Programmer's Manual.
  6. The Linux implementation of this interface may differ (consult
  7. the corresponding Linux manual page for details of Linux behavior),
  8. or the interface may not be implemented on Linux.
  9. .\"
  10. .SH NAME
  11. creal,
  12. crealf,
  13. creall
  14. \(em complex real functions
  15. .SH SYNOPSIS
  16. .LP
  17. .nf
  18. #include <complex.h>
  19. .P
  20. double creal(double complex \fIz\fP);
  21. float crealf(float complex \fIz\fP);
  22. long double creall(long double complex \fIz\fP);
  23. .fi
  24. .SH DESCRIPTION
  25. The functionality described on this reference page is aligned with the
  26. ISO\ C standard. Any conflict between the requirements described here and the
  27. ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
  28. .P
  29. These functions shall compute the real part of
  30. .IR z .
  31. .SH "RETURN VALUE"
  32. These functions shall return the real part value.
  33. .SH ERRORS
  34. No errors are defined.
  35. .LP
  36. .IR "The following sections are informative."
  37. .SH EXAMPLES
  38. None.
  39. .SH "APPLICATION USAGE"
  40. For a variable
  41. .IR z
  42. of type
  43. .BR complex :
  44. .sp
  45. .RS 4
  46. .nf
  48. z == creal(z) + cimag(z)*I
  49. .fi
  50. .P
  51. .RE
  52. .SH RATIONALE
  53. None.
  54. .SH "FUTURE DIRECTIONS"
  55. None.
  56. .SH "SEE ALSO"
  57. .IR "\fIcarg\fR\^(\|)",
  58. .IR "\fIcimag\fR\^(\|)",
  59. .IR "\fIconj\fR\^(\|)",
  60. .IR "\fIcproj\fR\^(\|)"
  61. .P
  62. The Base Definitions volume of POSIX.1\(hy2017,
  63. .IR "\fB<complex.h>\fP"
  64. .\"
  65. .SH COPYRIGHT
  66. Portions of this text are reprinted and reproduced in electronic form
  67. from IEEE Std 1003.1-2017, Standard for Information Technology
  68. -- Portable Operating System Interface (POSIX), The Open Group Base
  69. Specifications Issue 7, 2018 Edition,
  70. Copyright (C) 2018 by the Institute of
  71. Electrical and Electronics Engineers, Inc and The Open Group.
  72. In the event of any discrepancy between this version and the original IEEE and
  73. The Open Group Standard, the original IEEE and The Open Group Standard
  74. is the referee document. The original Standard can be obtained online at
  75. http://www.opengroup.org/unix/online.html .
  76. .PP
  77. Any typographical or formatting errors that appear
  78. in this page are most likely
  79. to have been introduced during the conversion of the source files to
  80. man page format. To report such errors, see
  81. https://www.kernel.org/doc/man-pages/reporting_bugs.html .